463^5 ί 2tu i'.doc/0()6 Λ7 137 經濟部智慧財產局員工消費合作社印製 五、發明說明（/) 本發明是有關於一種光學儲存裝置之相對尋軌數計數 方法及尋軌系統，且特別是有關於…種光學儲存裝置之動 態修正相對尋軌數計數方法及尋軌系統。 磁碟片的資料軌（Track)，是以同心圓的方式配置於 磁碟片上。而數位光碟片（Optical St〇rage Duk)的資料 軌，則是以螺旋狀的方式，由內向外配置於光碟片上。所 以光碟片的資料軌是一條連續的螺旋凹槽，而不是由數個 同心圓所構成。 爲Γ儲存實際資料、控制、偵錯（E1. i_o r De t ec t i on ) 和糾錯（Erroi· Correction)等的考量，因此在光碟片的資 料結構中定義了資料格（Frame)與資料區段（Sect〇r)等， 以作爲儲存資料的單位。請參照第1圖，其所繪示的是數 位光碟片的資料軌示意圖。如圖所示，儲存於光碟片100 上的資料是以資料格（F1. ame ) 104爲單位來區隔，每一個資 料格104又可以再被細分爲起始區（Subcode) 106a與資料 區（Data)106b，而起始區]〇6a內的Q碼（Q Code)與資料 區段辨識碼（Sec tor ID)] 08，則是用以分別描述資料區104 中所儲存之資料的性質，以及其在碟片1〇〇上的位置。每 一個資料軌102是由環繞碟片1〇〇中心一週的數個資料格 所構成，例如第1圖其中一個資料軌是由資料格104a、 104b、104c 及 104d 所構成。 在存取光碟片的資料時，可以採用定線速（Constant Linear Velocity, CLV)或定角速（Constant Angular Velocity, CAV)的方式進行。由於接近光碟片內側的螺旋 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -----^------('裝--------訂---------旅 (請先閱讀背面之注意事項再填寫本頁) 4 6 3 1 5 i A7 ，4() I 0()(1 1 * ____B7__ 五、發明說明（>) 圓周較短，所以資料軌長度較短，能存放的資料也較少。 (請先閱讀背面之注意事項再填寫本頁) 相對地，光碟片外側資料軌較長’可存放的資料亦較多u 因此以定角速存取光碟片內容時，內環資料的讀取速率較 慢，外環的資料讀取速率則較快。而以定線速存取光碟片 內容時，在讀取光碟片內側資料時，光碟機的馬達轉速必 須較快，讀取外側資料時之馬達轉速則必須較慢。 光碟機在隨機存取（Random Access)碟片上的資料時， 必須使光學讀取頭（Pickup Head)沿著碟片徑向（Radial Direct ion)移動到欲讀取之資料所在的資料軌上，此一動 作便稱爲尋軌（Seeking)。在讀取位於特定資料軌上特定 資料格內的資料時1則必須使光學讀取頭沿著資料軌切線 方向移動，進行所謂的循軌（Track Foil owing)動作u 經濟部智慧財產局員工消費合作杜印製 -·般而言，由於光碟片上各資料軌之間的間距是一個 固定常數，例如CD(Compact Disk)系光碟片的軌距爲1,6 微米（M i c ron，μπι) ’而數位多功能光碟（D1 g i U丨Ve r s a t i 1 e Disc, DVD)的軌距則是0.74微米。因此，光碟片上任意 兩個資料軌之間的相對距離，可以由其所對應之Q碼及資 料區段辨識碼求得。利用上述雨個條件即可計算出任意兩 個資料軌之間的相對軌道數，提供系統作爲執行尋軌動作 時的依據。但是由於無法精確計算所需資料軌之相對軌道 數、以及進行尋軌動作時所產生的誤差、還有光碟片表面 的刮痕、缺陷等，或者是光碟片本身在進行資料錄製時， 其資料密度隨資料量而改變，以及不同光碟片在其錄製資 料時所反映之定線速度不同等’上述這些因素均會造成重 4 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公楚) " 463151 -^9 i 2u\ f. J〇c ()()6 A? B7 經濟部智慧財產局員工消費合作社印製 、發明說明（$ ) 複尋軌而延Μ光碟機的存取時間、降低光碟機的性能。 爲了解決上述的這些問題，在美國專利第5,195,068 號中提出了一種方法’利用多個線性方程式來逼近定線速 光碟片中Q碼（或資料區段辨識碼）內的絕對時間（Abs〇Uue Τι me )與其資料區所在的絕對軌數（Tl. ack Numbe 1.)兩者之 間的函數關係。在進行尋軌動作時，系統便利用這些儲存 在記憶體中之線性方程式的參數，以計算所需要的跨軌 數。然而由於是以線性方程式來逼近一個非線性函數，因 此在某些區段所計算出的跨軌數仍有較大的誤差，導致其 所能適用的範圍受到限制。 而在台灣專利第081,366號中，則是提出了一個更精 確的方法，用以計算相對尋軌數並可進行不同定線速之校 正。在此一方法中’首先利用光碟片與軌道之間的非線性 幾何關係來建立參考光碟片的表格資料，當光碟片置入驅 動裝置內啓動時’便執行光碟片校正程序以求得此光碟片 之定線速指標參數與時間修正係數，而利用這兩個參數與 參考光碟片的表格資料，即可求出此光碟片的相對尋軌 數c 由於單倍速唯讀光碟機（1 xs CD-ROM)之定線速（CLV) 內圈轉速爲8Hz，亦即每秒旋轉8圈。以50倍速唯讀光碟 機（50XS CD-ROM)爲例，其馬達轉速相當於20倍速之定 線速內圏轉速，也就是馬達轉速爲160Hz，主軸馬達每6.25 毫秒（mi 1 1 i - second，ms)旋轉一圏。對一般伺服系統而言， 尋200軌需時25毫秒。因此在進行尋200軌的同時，50 -----1------^ --------^---------^ (請先閱讀背面之注意事項再填冩本頁) 本紙張尺度適用申國國家標準（CNS)A4規格（210 X 297公釐） 4 63彳 5 1 4 9 121 w Γ. d 〇 c. 〇 〇 6 A7 B7 五、發明說明（f) 倍速唯讀式光碟機的主軸馬達已經旋轉4_。 而單倍速數位多功能唯讀光碟機（1XS DVD-ROM)，其 定線速內圈轉速約爲23. 1Hz，亦即主軸馬達每秒旋轉23. 1 圈。就20倍速數位多功能唯讀光碟機（2〇xS DVD-ROM)而 言，其馬達轉速相當於8倍速之定線速內圈轉速，所以馬 達轉速爲]60Hz，主軸馬達每6.25毫秒即旋轉一圈。以一 般伺服系統而言，尋200軌需時25毫秒，因此與前述例 子相同’在尋200軌的同時，主軸馬達已經旋轉了 4圈。 所以由上述兩個例子可知，無論是向外或向內尋2〇〇軌， 至少將會造成4軌的誤差。 在前述兩個專利中所提出的方法中，都是針對光碟片 本身軌道分布的情形來計算尋軌數；換言之，以ί:述的習 知方法所ί5十算出之跨軌數’僅適用於光碟片相對於光學讀 取頭爲靜止的狀態。然而當光學讀取頭開始進行尋軌動作 時’光碟片的轉速並不爲零，所以光學讀取頭與光碟片之 間具有相對運動，於是產生相對尋軌數的誤差，並造成重 複尋軌’也因此降低了光碟機的存取速度，導致存取時間 增長。 由此可見’當光碟機執行尋軌動作時，光學讀取頭與 光碟片之間的相對運動會造成相對尋軌數的計算錯誤a因 此’本發明提供...種光學儲存裝置之動態修正相對尋軌數 計數方法及尋軌系統，以修正當光學讀取頭與光碟片均處 於動態時所產生的相對尋軌數的誤差，使光學讀取頭得以 準確移動至正確的資料軌讀取資料，以降低平均跳軌次 本紙張尺度適用中國國家標準（CNS)A4規格Χ297公釐） ------------ί -裝— (請先閱讀背面之注意事項再填寫本頁) —訂---------線 經濟部智慧財產局員工消費合作社印製 經濟部智慧財產局員工消費合作社印製 4631 5 1 1 ΓλΙ/()Οίι Λ7 __ R7 五、發明說明（$) 數，縮短半均μ料拾取時間（A c c e s s T丨m e )，提高光學j·諸 存裝廣的拾取速率（A c c e s s S p e e d)，增進光學儲存裝置的 存取效能。 根據本發明之述及其他目的，提出一種光學儲存裝 置之動態修正相對尋軌數計數方法。首先重置碟片旋轉圏 數及跨軌誤差零交越信號，並設定靜態相對尋軌數，再進 行尋軌動作。讀取碟片旋轉圈數及跨軌信號序列，根據靜 態相對尋軌數及跨軌信號計算剩餘軌數，並依照迴授訊號 脈衝數目判斷是否送出溢位旗號。若送出溢位旗號，則將 碟片旋轉圈數增加，並重置迴授訊號脈衝數目，再判斷是 否爲向外尋軌。若未送出溢位旗號，則直接進行判斷，決 定是否爲向外尋軌。若判定爲向外尋軌，且剩餘軌數等於 碟片旋轉圈數，則結束尋軌動作，否則繼續進行尋軌動作。 若判定爲向內尋軌，且剩餘軌數等於碟片旋轉圏數之負 値，則結束尋軌動作，否則繼續進行前述尋軌動作。 此外，根據本發明之上述及其他目的，提出一種光學 儲存裝置之動態修正相對尋軌數的尋軌系統，用以實現前 述之動態修正相對尋軌數的計數方法，其中包括下數計數 • 器、上數計數器及微處理器等。下數計數器分別與光學讀 寫頭及微處理器耦接，接收靜態相對尋軌數、致動訊號和 TEZC信號，計算剩餘軌數。上數計數器分別與主軸馬達及 微處理器耦接，接收主軸馬達迴授訊號，計算碟片轉數， 並產生計數器溢位旗號。微處理器分別與下數計數器及上 數計數器耦接，藉致動訊號控制下數計數器與上數計數 7 -----------^ --------^-------- (請先閱讀背面之注意事項再填冩本頁) 本紙張尺度適用中圉國家標準（CNS)A4規格（210^297公釐） 4 53151 „ 4 〇 I 2l wf.doc/0 06 __B7__ 五、發明說明（匕） 器’以重置訊號設定上數計數器，使其TEZC信號之脈衝 計數歸零’並計算靜態相對尋軌數、比較溢位旗號與剩餘 軌數、決定光學讀寫頭是否到達目標軌，以及控制驅動器 使光學讀寫頭移動至定位等。 爲讓本發明之上述和其他目的、特徵、和優點能更明 顯易懂，下文特舉較佳實施例，並配合所附圖式，作詳細 說明如下： 圖式之簡單說明： 第I圖所繪示爲數位光碟片的資料軌示意圖； 第2圖所繪示爲光碟片橫切面與其所對應之跨軌誤差 零交越信號的對照示意圖； 第3圖所繪示爲光碟片轉動時，光學讀寫頭於光碟片 上移動之軌跡示意圖； 第4圖所繪示爲光碟片資料軌道分布與旋轉圈數之關 係示意圖； 第5圖所繪示爲光學儲存裝置之尋軌伺服系統的方塊 示意圖； 第6圖所繪示爲依照本發明之較佳實施例，一種光學 儲存裝置之動態修正相對尋軌數的尋軌系統，其結構的方 塊示意圖； 第7圖所繪示爲依照本發明之較佳實施例，一種光學 儲存裝置之動態修正相對尋軌數的尋軌系統，進行尋軌動 作時各種訊號的時序圖；以及 第8圖所繪示爲依照本發明之較佳實施例，一種光學 Η 本紙張尺度適用中國國家標準（CNS)A4規格公釐） -----------f 裝--------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作杜印製 4 6 315 1 40 I 2ί\ν Γ doc 006 經濟部智慧財產局員工消費合作社印製 B7 五、發明說明（q) 儲存裝置之動態修正相對尋軌數的計數方法及尋軌系統， 其進行尋軌動作時的流程圖。 圖式之標記說明： 100、300、500 :光碟片 102、302、302a、302b、302c :資料軌 104、U)4a、104b、104c、104d :資料格 106a :起始區 106b :資料區 1〔)8 : Q碼與資料區段辨識碼 304、400、504 :光學讀寫頭 306、402、404 ' 406、4Q8 :移動路徑 410a、410b ' 410c、410d :碟片旋轉圈數界線 502 :主軸馬達 506 ‘·前級處理器 508 :跨軌誤差零交越信號 510 :主軸馬達迴授訊號 600 :微處理器 602 :下數計數器 604 :上數計數器 8〇〇〜814 :應用本發明之動態修正相對尋軌數的計數 方法及尋軌系統，進行尋軌動作時的步驟 實施例 光碟機的尋軌控制系統是藉由光學讀寫頭所感測到之 跨軌誤差零交越（Track Error Zero Crossing, TEZCKt 本紙張尺度適用中國國家標準（CNS)A4規格（210x297公釐） -----.------f r裝--------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 4 15 1 五、發明說明（） 號或循軌誤差信號（Tracking Error Signal, TES)，來計 算其目前已跨越的軌數在CD系光碟機中’常用的循軌 誤差偵測法是三光束法；而在數位多功能光碟機（DVD)中， 則是採用差分相位偵測法（Differential Phase Detecting, DPD)或外差法等，以獲得循軌誤差訊號。 請參照第2圖，其所繪不的是光碟片棱切面與其所對 應之跨軌誤差零交越信號的對照示意圖。如第2圖所示， 其中碟片橫切面具有連續凹凸起伏的剖面結構’由此可知 資料軌道的分布情形。從光學讀寫頭可以獲得對應於碟片 剖面之凹凸結構的跨軌誤差零交越（TEZC)信號，與碟片橫 切面相互比對，則可以看出光學讀寫頭每越過一個資料 軌，在TEZC信號序列中就會產生一個方波脈衝（Pulse)， 藉由計算這些脈衝的數目，便可以得知光學讀寫頭跨越了 多少資料軌。 請參照第3圖，其所繪示的是當光碟片轉動時，光學 讀寫頭於光碟片上移動之軌跡示意圖。如第3圖所示，圯 碟片300上的資料軌302是以螺旋狀的實線來表示，由於 光學讀寫頭304與光碟片300之間具有一相對轉速，因此 光學讀寫頭304隨時間改變的移動路徑306亦是以螺旋的 方式前進，而光學讀寫頭304之移動路徑306是以虛線來 表示。 在第3圖中，光學讀寫頭304原本位於資料軌第k軌 302a，若目標軌是設定於資料軌第k+2軌302c。依照習知 方法來計算相對尋軌數時，則必須當TEZC信號序列中之 本紙張反度適用中國國家標準（CNS>A4規格（210 X 297公髮） --------- - 丄' '^--------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消费合作社印製 46 315 4 9 1 2iu f.doc/〇0 6 Λ； Β7 經濟部智慧財產局員工消費合作杜印製 五、發明說明（巧） 脈衝數目爲2時，光學讀寫頭304才能到達目標軌。但是 由第3圖可知，光學讀寫頭304與光碟片300之間的相對 轉速較大時，光學讀寫頭304並未越過資料軌第k+Ι軌 3 0 2 b，而是直接由資料軌第k軌3 ϋ 2 a跳至資料軌第k+2 軌3 0 2 c ’因此所測得TEZC信號序列中僅有1個方波脈衝 訊號。也就是當光學讀寫頭304由資料軌第k軌302a移 動至目標資料軌第k+2軌302c，此時光碟片300亦旋轉一 週，雖然TEZC信號顯不光學讀寫頭304僅跨越一軌，然 而實際上光學讀寫頭304已經跨越兩軌。 因此，當光碟機執行尋軌動作時，光學讀寫頭與光碟 片之間的相對運動會造成相對尋軌數的計算錯誤。爲了修 正當光學讀寫頭與光碟片均處於動態時所產生的相對尋軌 數的誤差’以下分別就動態修正相對尋軌數之計數方法的 原理，以及其所需的硬體架構與韌體加以說明。 一、計算原理： 請參照第4圖，其所繪示的是光碟片上資料軌道分布 與其旋轉圏數之間的關係示意圖，可以將其視爲把光碟片 上螺旋狀資料軌拉直後的示意圖。圖中橫軸代表的是將資 料軌拉直延伸的方向，即是軌道長度方向，縱軸所代表則 是光碟片的徑向方向，而線410a、41 Ob、410c及41 0d代 表光碟片旋轉圈數界線，光學讀寫頭400之移動路徑則是 分別以虛線402、404 ' 406及408來表示。在線410a與 線410b之間的區域爲光碟片旋轉第m圈時各資料軌在光 碟片徑向的分佈，依此類推，線41 Ob與線410c以及線410c 本紙張尺度適用中國國家標準（CNS)A4規格（21ϋχ 297公釐） ------------------訂--------- (請先閱讀背面之注急事項再填寫本頁) 46315 1 2l\v I'.iloc 0 0 6 A： B? 經濟部智慧財產局員工消費合作杜印製 $'、發明說明（γ) 與線4 1 Od之間分別爲光碟片旋轉第m+1圈和第m+2圈時 資料軌的分佈狀況 _先分析光學讀寫頭在光碟片上向外尋軌的情況1如 第4圖所示，光學讀寫頭400在光碟片旋轉第m圈時位於 資料軌第k軌，當g標軌設定爲資料軌第k+n軌時，其相 對尋軌數即爲η。假設光學讀寫頭400能夠在光碟片旋轉 第m圈結束之前到達目標軌第k+n軌，也就是光學讀寫頭 400以沿著第一路徑402的方式向目標軌前進，那麼當光 學讀寫頭400所讀取之TEZC信號序列的脈衝計數等於n 時，光學讀寫頭400即到達目標軌第k+n軌。 但是，當光學讀寫頭400與光碟片之間的相對轉速變 大時，光學讀寫頭400將會被迫進入光碟片旋轉第ni+1圈 的區域範圍。若是光學讀寫頭400以沿著第二路徑404的 方式前進，則由第二路徑404可以看出，當光學讀寫頭400 從光碟片之第m圈區域進入第m+1圈區域時，並沒有跨越 資料軌第k+Ι軌，而是由第m圈第k軌直接往第m+Ι圈第 k+2軌前進。所以相對尋軌數在光碟片旋轉第m+i圏時， 就必須被修正爲η-1，以供TEZC信號序列脈衝計數參考。 因此’可以歸納出下面的計算法則： (法則一）當光學讀寫頭沿光碟片向外尋軌，且尙未到 達Ν標軌時，光碟片之旋轉數目每增加一圈，則相對尋軌 數必須減少軌。 其次討論光學讀寫頭在光碟片上向內尋軌的情況，與 前述情況類似，請參照第4圖所示，光學讀寫頭400在光 ----------a, --------訂---------竣 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適闬中國國家標準（CNS)A4規格UlOx 297公釐） 4 6315 1 4 9 I 2iwl doc/OiJ6 A7 五、發明說明（/7 ) 碟片旋轉第m _時位於資料軌第k軌，當目標軌設定爲資 料軌第k-n軌時’則其相對尋軌數仍爲^。若光學讀寫頭 400能夠在光碟片旋轉第m圈結束之前到達g標軌第k-n 軌’也就是光學讀寫頭400以沿著第三路徑406的方式向 目標軌前進’那麼當光學讀寫頭400所讀取之TEZC信號 序列的脈衝計數等於η時，亦即光學讀寫頭400到達目標 軌第k-n軌。 然而光學讀寫頭400與光碟片之間的相對轉速變大 時’光學讀寫頭400將會被迫進入光碟片旋轉第m+i圈的 區域範圍。而光學讀寫頭400若是以沿著第四路徑408的 方式前進，則由第四路徑408可以看出，當光學讀寫頭400 從光碟片β第m圈區域進入第m+1圈區域時，其並未跨越 資料軌第k-Ι軌，而是由第m圈第k軌又往第m+1圈第k 軌前進。因此相對尋軌數在光碟片旋轉第m+1圈時，就必 須被修正爲n+1，以供TEZC信號序列脈衝計數參考。所以 可歸納出下面的計算法则： (法則一）當光學讀寫頭沿光碟片向內尋軌，且尙未到 達目標軌時，光碟片之旋轉數目每增加一圈，則相對尋軌 數必須增加一軌。 二、硬體架構與其配合之韌體： 請參照第5圖，其所繪示的是光學儲存裝置之尋軌伺 服系統（Seeking Servo)，其結構的方塊不意圖。如第5 圖所示，光碟片500是由主軸馬達（Spindle Motor)502驅 動而旋轉，而光學讀寫頭504則是用以將資料寫入光碟片 --------------I----訂·'--------I (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 本纸張尺度適用中國國家標準（CNS)A4規格（21ϋ X 297公釐） 經濟部智慧財產局員工消費合作社印製 4631 5 1 4 I 21 w I. ί-i 〇 c ' 0 0 6 ^ * 137 五、發明說明（/1) 500或是由光碟片500讀取資料，主軸馬達502與光學讀 寫頭504分別由驅動器（P〇wer Driver)所驅動。由光學讀 寫頭504所讀取到的信號，經前級處理器（rf AMP)506處 理後’可以得到跨軌誤差零交越（TEZC)信號5 08利用跨 軌誤差零交越信號508以及由主軸馬達502所回饋的迴授 訊號510 ’並配合前述之計算法則，即可在進行尋軌動作 時，以動態方式修正光學讀寫頭所在資料軌與目標軌之間 的相對尋軌數。 請參照第6圖’其所繪示的是依照本發明之較佳實施 例，一種光學儲存裝置之動態修正相對尋軌數的尋軌系 統，其結構的方塊示意圖。本發明用以動態修正相對尋軌 數的尋軌系統中，包括下數計數器（Down Counter)602、 上數計數器（Up Counter )604及微處理器（Microprocessor) 600 等。 如第6圖所示，其中下數計數器602分別與光學讀寫 頭（如第5圖中之504)及微處理器600耦接，用以接收由 微處理器600所提供之靜態相對尋軌數和致動（Enable)訊 號以及來自光學讀寫頭的TEZC信號，以計算剩餘軌數 (Residue Track Number)，並將其輸出至微處理器600。 而上數計數器604是分別與主軸馬達（第5圖中之502)及 微處理器600耦接，用以接收由主軸馬達回饋的迴授訊號 來計算碟片轉數，並將計數器溢位旗號（Overflow Flag) 輸出至微處理器600。 而第6圖中之微處理器600分別與下數計數器602及 本紙張尺度適用中國國家標準（CNS)A4規格·（_210 X 297公釐） -----------{ -裝--------訂---------R (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印" 46315 1 40 ! 2i wf. Joe ;00 6 八7 B7 五、發明說明（/)) 上數計數器604耦接，藉由致動訊號控制下數計數器602 與上數計數器604，並以重置（Reset)訊號設定上數計數器 604，使其TEZC信號之脈衝計數歸零。微處理器600之功 能包括：計算靜態相對尋軌數、比較由上數計數器604輸 出之計數器的溢位旗號與下數計數器602所輸出的剩餘軌 數、決定光學讀寫頭是否到達目標軌，以及控制驅動器使 光學讀寫頭移動至定位等。 請參照第7圖，其所繪示的是依照本發明之較佳實施 例，一種光學儲存裝置之動態修正相對尋軌數的尋軌系 統，進行尋軌動作時各種訊號的時序圖。其中包括跨軌誤 差零交越（TEZC)信號、主軸馬達迴授訊號、計數器溢位旗 號、重置訊號，以及碟片旋轉圈數和剩餘軌數等。而第8 圖所繪示的則是依照本發明之較佳實施例，一種光學儲存 裝置之動態修正相對尋軌數的計數方法及尋軌系統，其進 行尋軌動作時的流程示意圖《 第7圖中之跨軌信號由光學讀寫頭提供，爲下數計數 器所接收，配合微處理器所設定之靜態相對尋軌數，用以 計算剩餘軌數。由於主軸馬達每旋轉一週時，其主軸馬達 迴授訊號便產生六個方波脈衝，上數計數器根據由主軸馬 達接收之迴授訊號脈衝，產生對應之計數器溢位旗號，因 此上數計數器每接收六個迴授訊號脈衝即產生一個對應的 溢位旗號。微處理器接收上數計數器輸出之溢位旗號後， 將重置訊號傳輸至上數計數器，使其迴授訊號脈衝計數歸 零’以重新計算迴授訊號脈衝數量，並據以計算光碟片旋 本紙張尺度適用中國國家標準（CNS)A4規格（2】ϋ X 297公釐） (請先閱讀背面之注意事項再填寫本頁) 裝--------訂----- 鋒 五 , 經濟部智慧財產局員工消費合作社印製 463151 4l) I 2t\\t\doc 00() B7 發明說明（4) 轉圈數。微處理器依照所得到的碟片旋轉圈數及剩餘軌 數’即可在進行尋軌動作時，根據前述的計算方法，以動 態方式修正光學讀寫頭所在資料軌與目標軌之間的相對尋 軌數。 關於本發明之動態修正相對尋軌數的計數方法及尋軌 系統，請參照第8圖，並配合第7圖與參酌第6圖所示， 將s兌明如~1、u如弟8圖中之步驟8 0 0 ’首先將儲存於微處 理器（第6圖中之600)中的碟片旋轉圏數K設定爲零 (K=0)，亦即將微處理器中的旋轉圏數暫存器之値設定爲 零ϋ並以微處理器（第6圖中之600)重置計數器，將靜態 相對尋軌數Ν設定於下數計數器（第6圖中之602)內，而 上數計數器（第6圖中之604)則被設定爲0。 其次，如第8圖中之步驟802，執行尋軌動作。接著 再進行第8圖中之步驟804，並同時參照第7圖，此時下 數計數器由光學讀寫頭獲得跨軌信號，配合靜態相對尋軌 數以獲得剩餘軌數Ν，而匕數計數器則由主軸馬達接收其 輸出之迴授訊號。下數計數器每接收到一個跨軌信號，便 修正其相對尋軌數，並將修正後所得到之剩餘軌數傳送至 微處理器。然後如第8圖中之步驟806，上數計數器依據 其所接收之主軸馬達迴授訊號，以決定是否送出溢位旗 號。當其從主軸馬達所接收之迴授訊號脈衝數目到達六個 時，則由上數計數器送出-個計數器溢位旗號傳輸至微處 理器。 若上數計數器送出溢位旗號’則進行第8圖中之步驟 -----------^ .—---—訂---------線 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS)A4規格（2〗0 >^97公g ) 463151 Λ7 B7 五、發明說明（6) 808，微處理器接收來自上數計數器之溢位旗號後，根據 所接收到的計數器溢位旗號，將碟片旋轉圈數設定爲增加 一圈，亦即將旋轉圏數暫存器所存之値增加一，並將重置 訊號傳送至上數計數器，使其迴授訊號脈衝計數歸零。然 後如第8圖中之步驟810,判斷尋軌動作是否爲向外尋軌。 若上數計數器並未送出溢位旗號，則直接進行第8圖中之 步驟810，判斷是否爲向外尋軌。 若第8圖之步驟810判斷爲向外尋軌，則進行第8圖 中之步驟812,由微處理器判斷下數計數器中之剩餘軌數 是否等於旋轉圈數暫存器所儲存之碟片旋轉圈數。當下數 計數器中之剩餘軌數等於旋轉圏數暫存器所儲存之碟片旋 轉圈數時，則光學讀寫頭已到達目標資料軌，所以結束尋 軌動作。若下數計數器中之剩餘軌數不等於旋轉圈數暫存 器所儲存之碟片旋轉圈數時，則再重覆第8圖中之步驟 802，繼續尋軌動作。 如果第8圖之步驟810判斷並非向外尋軌時，亦即所 進行之尋軌動作爲向內尋軌，則進行第8圖中之步驟8] 4， 由微處理器判斷下數計數器中之剩餘軌數是否等於旋轉圈 數暫存器所儲存之碟片旋轉圈數的負値。當下數計數器中 之剩餘軌數等於旋轉圈數暫存器所儲存之碟片旋轉圈數的 負値時，則光學讀寫頭已到達目標資料軌，所以結束尋軌 動作◦若下數計數器中之剩餘軌數不等於旋轉圏數暫存器 所儲存之碟片旋轉圈數的負値時，則再重覆第8圖中之步 驟802，繼續尋軌動作。 (請先閱讀背面之注意事項再填寫本頁) {t--------訂---------線 經濟部智慧財產局員工消费合作社印製 本紙張尺度適用中國國家標準（CNS)A4規格（210 x 297公釐） 經濟部智慧財產局員工消費合作社印製 4 631 5 1463 ^ 5 ί 2tu i'.doc / 0 () 6 Λ7 137 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (/) The invention relates to a relative tracking number counting method for an optical storage device and Tracking system, and in particular relates to a method for dynamically correcting relative tracking number counting method and tracking system of an optical storage device. The data track of the disk is arranged on the disk in a concentric circle. The digital optical disc (Optical Storage Duk) data track is arranged on the disc from the inside out in a spiral manner. The data track of the disc is therefore a continuous spiral groove, rather than a concentric circle. The actual data, control, error detection (E1. I_or r De t ec ti on), and error correction (Erroi · Correction) are considered for Γ. Therefore, the data frame (Frame) and data are defined in the data structure of the optical disc. Section (Sector), etc., as a unit for storing data. Please refer to Figure 1, which shows a schematic diagram of the data track of a digital disc. As shown in the figure, the data stored on the optical disc 100 is divided by a data cell (F1. Ame) 104, and each data cell 104 can be further subdivided into a starting region (Subcode) 106a and a data region. (Data) 106b, and the Q code (Q Code) and data segment identification code (Sec tor ID) 08 in the starting area] 06a are used to describe the nature of the data stored in the data area 104, respectively. , And its position on the disc 100. Each data track 102 is composed of several data cells around the center of the disc 100. For example, one of the data tracks in FIG. 1 is composed of data cells 104a, 104b, 104c, and 104d. When accessing the data of the optical disc, the method of Constant Linear Velocity (CLV) or Constant Angular Velocity (CAV) can be used. Due to the spiral size of the paper close to the inside of the disc, the Chinese National Standard (CNS) A4 specification (210 X 297 mm) is applicable. ----- ^ ------ ('Package -------- Order --------- Brigade (Please read the notes on the back before filling this page) 4 6 3 1 5 i A7, 4 () I 0 () (1 1 * ____B7__ V. Description of the invention (> ) The circumference is shorter, so the length of the data track is shorter, and less data can be stored. (Please read the precautions on the back before filling out this page.) In contrast, the longer data track on the outside of the disc can store more data. Therefore, when accessing the content of a disc at a constant angular speed, the data read rate of the inner ring is slower, and the data read rate of the outer ring is faster. When accessing the content of the disc at a fixed line speed, the data is read. When the data on the inside of the optical disc, the speed of the motor of the optical disc drive must be fast, and the speed of the motor when reading the external data must be slow. When the optical disc drive reads the data on the Random Access disc, it must be optically read. The Pickup Head moves along the radial direction of the disc to the data track where the data to be read is located. This action is called Seeking king). When reading data located in a specific data cell on a specific data track1, the optical pickup must be moved along the tangent direction of the data track to perform the so-called Track Foil owing operation u Intellectual property of the Ministry of Economic Affairs Printed by the Bureau ’s Consumer Cooperation Duo-In general, because the distance between data tracks on a disc is a fixed constant, for example, the track pitch of CD (Compact Disk) discs is 1,6 microns (Micron, μπι) 'The track pitch of a digital multi-function disc (D1 gi U 丨 Verati 1 e Disc, DVD) is 0.74 microns. Therefore, the relative distance between any two data tracks on the disc can be determined by its corresponding The Q code and data segment identification code can be obtained. Using the above rain conditions, the relative track number between any two data tracks can be calculated, providing the system as a basis for performing the tracking operation. However, it cannot be accurately calculated The relative track number of the data track, the error generated during the tracking operation, the scratches and defects on the surface of the optical disc, or the data density of the optical disc itself during data recording varies with The amount of material changes, and the different line speeds reflected by different optical discs when recording data, etc. 'These factors mentioned above will cause heavy weight. 4 This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 cm) " 463151-^ 9 i 2u \ f. J〇c () () 6 A? B7 Printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs, printed and invented ($) Retracking to extend the access time of the M optical disc drive 2. Reduce the performance of the optical disc drive. In order to solve these problems, a method is proposed in US Patent No. 5,195,068, which uses multiple linear equations to approximate the absolute time (Abs〇Uue) in the Q code (or data segment identification code) in a fixed-line-speed optical disc. The function relationship between Tme and the absolute track number (Tl. Ack Numbe 1.) where the data area is located. During the tracking operation, the system conveniently uses the parameters of the linear equations stored in the memory to calculate the required number of cross-tracks. However, because a non-linear function is approximated by a linear equation, the number of cross-tracks calculated in some sections still has a large error, which limits its applicable range. In Taiwan Patent No. 081,366, a more accurate method is proposed, which is used to calculate the relative tracking number and to perform calibration at different fixed line speeds. In this method 'first use the non-linear geometric relationship between the optical disc and the track to create the table data of the reference optical disc. When the optical disc is placed in the drive and started,' the optical disc calibration procedure is performed to obtain the optical disc. The fixed line speed index parameter and time correction factor of the film, and using these two parameters and the table data of the reference disc, the relative tracking number of the disc can be obtained. C Because of the single-speed read-only optical disc drive (1 xs CD -ROM) The fixed line speed (CLV) inner ring speed is 8Hz, which means 8 rotations per second. Taking a 50xS CD-ROM as an example, its motor speed is equivalent to a fixed line speed internal speed of 20x speed, that is, the motor speed is 160Hz, and the spindle motor every 6.25 milliseconds (mi 1 1 i-second , Ms) rotate for a moment. For general servo systems, it takes 25 milliseconds to find 200 tracks. So while searching for 200 tracks, 50 ----- 1 ------ ^ -------- ^ --------- ^ (Please read the notes on the back first (Refill this page) The paper size applies to the national standard of China (CNS) A4 (210 X 297 mm) 4 63 彳 5 1 4 9 121 w Γ. D 〇c. 〇〇6 A7 B7 V. Description of the invention (F) The spindle motor of the double-speed read-only optical disc drive has rotated 4_. The single-speed digital multi-function read-only optical disc drive (1XS DVD-ROM) has a fixed-line-speed inner-circle rotation speed of approximately 23. 1 Hz, which means that the spindle motor rotates at 23. 1 revolutions per second. For a 20x speed digital multi-function read-only optical disc drive (20xS DVD-ROM), the motor speed is equivalent to the fixed line speed of the inner ring speed of 8x speed, so the motor speed is 60Hz, and the spindle motor rotates every 6.25 milliseconds. A circle. For a general servo system, it takes 25 milliseconds to find 200 tracks. Therefore, it is the same as the previous example. While searching for 200 tracks, the spindle motor has rotated 4 times. Therefore, it can be known from the above two examples that whether it seeks 200 tracks outwards or inwards, it will cause an error of at least 4 tracks. In the methods proposed in the aforementioned two patents, the number of tracking is calculated for the situation of the track distribution of the optical disc itself; in other words, the number of cross-tracks calculated by the conventional method described above is only applicable to The optical disc is stationary with respect to the optical pickup. However, when the optical pickup starts the tracking operation, the speed of the optical disc is not zero, so there is relative movement between the optical pickup and the optical disc, which results in an error in the relative tracking number and causes repeated tracking. 'As a result, the access speed of the optical disc drive is reduced, leading to an increase in access time. It can be seen that 'when the optical disc drive performs a tracking operation, the relative movement between the optical pickup head and the optical disc will cause a calculation error of the relative tracking number a'. Therefore, the present invention provides ... Tracking number counting method and tracking system to correct the relative tracking number error when the optical pickup and the optical disc are both dynamic, so that the optical pickup can accurately move to the correct data track to read data In order to reduce the average jumping times, the paper size is applicable to the Chinese National Standard (CNS) A4 specification X297 mm) ------------ ί -pack — (Please read the precautions on the back before filling in this Page) —Order --------- Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economy 4631 5 1 1 ΓλΙ / () Οίι Λ7 __ R7 V. Description of the invention ($), Shorten the half-average μ material pick-up time (Accession), increase the optical pickup speed (Accession), and improve the access performance of the optical storage device. According to the description of the present invention and other objects, a method for counting the dynamically corrected relative tracking number of an optical storage device is proposed. First reset the disc rotation number and the cross-track error zero-crossing signal, and set the static relative tracking number, and then perform the tracking operation. Read the number of disc rotations and the cross-track signal sequence, calculate the remaining track number based on the static relative tracking number and the cross-track signal, and determine whether to send the overflow flag according to the number of pulses of the feedback signal. If the overflow flag is sent, increase the number of disc rotations and reset the number of feedback signal pulses. If the overflow flag is not sent, a judgment is made directly to determine whether it is an external tracking. If it is determined to seek outwards, and the number of remaining tracks is equal to the number of disc rotations, the tracking operation is ended, otherwise the tracking operation is continued. If it is determined to seek inward, and the number of remaining tracks is equal to the negative number of the disc rotation number, the tracking operation is ended, otherwise the foregoing tracking operation is continued. In addition, according to the above and other objects of the present invention, a tracking system for dynamically correcting the relative tracking number of an optical storage device is proposed to implement the foregoing method for counting the relative tracking number of the dynamic correction, including a down counter. , Up counter and microprocessor. The down counter is respectively coupled to the optical read / write head and the microprocessor, and receives the static relative tracking number, the activation signal and the TEZC signal, and calculates the remaining number of tracks. The up counter is respectively coupled with the spindle motor and the microprocessor, receives the feedback signal from the spindle motor, calculates the number of disc revolutions, and generates a counter overflow flag. The microprocessor is respectively coupled to the down-counter and the up-counter, and the actuation signal controls the down-counter and the up-counter 7 ----------- ^ -------- ^- ------- (Please read the notes on the back before filling in this page) This paper size is applicable to China National Standard (CNS) A4 (210 ^ 297 mm) 4 53151 „4 〇I 2l wf. doc / 0 06 __B7__ V. Description of the invention (Dagger) The device resets the count-up counter and resets the pulse count of the TEZC signal to zero. Decide whether the optical pickup head reaches the target track, and control the driver to move the optical pickup head to position, etc. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the preferred embodiments are enumerated below. In conjunction with the attached drawings, the detailed description is as follows: Brief description of the drawings: Figure I shows a schematic diagram of the data track of a digital disc; Figure 2 shows the cross section of the disc and its corresponding cross The comparison diagram of the zero-crossing signal of the track error; Figure 3 shows when the disc is rotating, Learn the trajectory of the movement of the read and write head on the optical disc; Figure 4 shows the relationship between the track distribution of the data on the optical disc and the number of rotations; Figure 5 shows the block diagram of the tracking servo system of the optical storage device Figure 6 shows a block diagram of the structure of a tracking system for dynamically correcting the relative tracking number of an optical storage device according to a preferred embodiment of the present invention; Figure 7 shows a diagram according to the present invention A preferred embodiment is a tracking system for dynamically modifying the relative tracking number of an optical storage device, and timing diagrams of various signals during a tracking operation; and FIG. 8 illustrates a preferred embodiment according to the present invention. Optical 尺度 The size of this paper applies to China National Standard (CNS) A4 mm) ----------- f Packing -------- Order --------- Line ( (Please read the notes on the back before filling out this page.) Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs for consumer cooperation Du printed 4 6 315 1 40 I 2ί \ ν Γ doc 006 Printed by the Consumers Cooperative of the Intellectual Property Bureau of Ministry of Economics printed B7 V. Description of the invention (Q) Dynamic correction relative tracking number of storage device Counting method and tracking system, the flowchart of the tracking operation. Symbols of the drawings: 100, 300, 500: Disc 102, 302, 302a, 302b, 302c: Data track 104, U) 4a, 104b , 104c, 104d: Data cell 106a: Start area 106b: Data area 1 () 8: Q code and data sector identification code 304, 400, 504: Optical read / write heads 306, 402, 404 '406, 4Q8: Mobile Paths 410a, 410b '410c, 410d: Disc rotation number boundary 502: Spindle motor 506', AV controller 508: Cross-track error zero crossing signal 510: Spindle motor feedback signal 600: Microprocessor 602: Next Count counter 604: Up counter 8000 ~ 814: Application of the method for dynamically correcting the relative tracking number and tracking system of the present invention, and the steps when performing the tracking operation Example The tracking control system of the optical disc drive is implemented by Track Error Zero Crossing (TEZCKt) detected by the optical read / write head This paper size is applicable to China National Standard (CNS) A4 (210x297 mm) -----.------ fr installed -------- order --------- line (Please read the precautions on the back before filling in this page ) 4 15 1 V. Invention Description () or Tracking Error Signal (TES) to calculate the number of tracks it has crossed. In CD-based optical disc drives, the commonly used tracking error detection method is three. The beam method; and in a digital versatile disc drive (DVD), differential phase detection (DPD) or heterodyne is used to obtain tracking error signals. Please refer to Fig. 2. What can not be drawn is the schematic diagram of the comparison between the disc cutting plane and the corresponding cross-track error zero-crossing signal. As shown in Fig. 2, where the cross-section of the disc has a cross-sectional structure with continuous unevenness, it is possible to know the distribution of the data track. The cross-track error zero-crossing (TEZC) signal corresponding to the uneven structure of the disc cross section can be obtained from the optical pickup head, and compared with the cross section of the disc, it can be seen that each time the optical pickup head crosses a data track, A square wave pulse (Pulse) will be generated in the TEZC signal sequence. By counting the number of these pulses, we can know how many data tracks the optical head has crossed. Please refer to Fig. 3, which shows the trajectory of the optical pickup head moving on the optical disc when the optical disc is rotated. As shown in FIG. 3, the data track 302 on the disc 300 is represented by a spiral solid line. Since the optical read-write head 304 and the optical disc 300 have a relative rotation speed, the optical read-write head 304 follows The time-varying movement path 306 also advances in a spiral manner, and the movement path 306 of the optical head 304 is indicated by a dotted line. In FIG. 3, the optical head 304 is originally located at the k-th track 302a of the data track. If the target track is set at the k + 2 track 302c of the data track. When calculating the relative tracking number according to the conventional method, the Chinese national standard (CNS > A4 specification (210 X 297)) must be applied when the paper inversion in the TEZC signal sequence is applicable ----------丄 '' ^ -------- Order --------- line (Please read the precautions on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 46 315 4 9 1 2iu f.doc / 〇0 6 Λ; Β7 Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, Consumer Cooperation Du printed 5. Description of the Invention (Clever) When the number of pulses is 2, the optical pickup 304 can reach the target track. As can be seen from the figure, when the relative rotation speed between the optical read-write head 304 and the optical disc 300 is large, the optical read-write head 304 does not pass through the data track k + 1, track 3 0 2b, but directly from the data track k-track. 3 ϋ 2 a jumps to the k + 2 track of the data track 3 0 2 c 'Therefore, there is only one square wave pulse signal in the measured TEZC signal sequence. That is, when the optical head 304 is moved from the k track 302a of the data track Move to the k + 2 track 302c of the target data track. At this time, the optical disc 300 also rotates once. Although the TEZC signal shows that the optical head 304 only spans one track, the optical The write head 304 has crossed two tracks. Therefore, when the optical disc drive performs a tracking operation, the relative movement between the optical read-write head and the optical disc will cause a calculation error of the relative tracking number. In order to correct the optical read-write head and the optical disc, The errors of the relative tracking number generated when they are all in dynamics' The following is the explanation of the principle of the dynamic correction of the relative tracking number counting method, and its required hardware architecture and firmware. I. Calculation principle: Please refer to Figure 4 is a schematic diagram showing the relationship between the distribution of the data track on the disc and the number of rotations, which can be considered as a schematic diagram after straightening the spiral data track on the disc. The horizontal axis in the figure represents the The straightening direction of the data track is the length of the track, the vertical axis represents the radial direction of the optical disc, and the lines 410a, 41 Ob, 410c, and 41 0d represent the boundary of the number of rotations of the optical disc. The optical read / write head The movement path of 400 is indicated by dotted lines 402, 404 '406, and 408, respectively. The area between line 410a and line 410b is the radial direction of each data track when the disc rotates in the mth turn Cloth, and so on, line 41 Ob and line 410c and line 410c This paper size applies the Chinese National Standard (CNS) A4 specification (21ϋχ 297 mm) ----------------- -Order --------- (Please read the urgent notes on the back before filling out this page) 46315 1 2l \ v I'.iloc 0 0 6 A: B? The consumer cooperation of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed $ ', description of the invention (γ) and line 4 1 Od are the distribution of the data track when the disc rotates at m + 1 and m + 2, respectively. First analyze the orientation of the optical head on the disc Case 1 of external tracking 1 As shown in FIG. 4, the optical pickup head 400 is located on the k-th track of the data track during the m-th rotation of the optical disc. When the g standard track is set to the k + n track of the data track, its relative The number of tracking is η. Assume that the optical pickup head 400 can reach the k + n track of the target track before the end of the m-th rotation of the disc, that is, the optical pickup head 400 advances to the target track along the first path 402. When the pulse count of the TEZC signal sequence read by the write head 400 is equal to n, the optical head 400 reaches the k + n track of the target track. However, when the relative rotation speed between the optical head 400 and the optical disc becomes larger, the optical head 400 will be forced to enter the area of the ni + 1 rotation of the optical disc. If the optical read-write head 400 advances along the second path 404, it can be seen from the second path 404 that when the optical read-write head 400 enters from the m-th circle area of the optical disc into the m + 1-th circle area, It does not cross the k + 1 track of the data track, but advances directly from the kth track of the mth track to the k + 2 track of the m + 1 track. Therefore, the relative tracking number must be corrected to η-1 when the disc rotates at m + i 圏, for reference of the TEZC signal sequence pulse count. Therefore, the following calculation rules can be summarized: (Law 1) When the optical read-write head seeks out along the optical disc and does not reach the N mark track, each time the number of rotations of the optical disc increases by one turn, the relative tracking is performed. The number must be reduced. Next, we discuss the case where the optical read-write head seeks inward on the optical disc. Similar to the previous situation, please refer to Figure 4, the optical read-write head 400 is in the light ---------- a,- ------ Order --------- End (Please read the notes on the back before filling this page) This paper is suitable for Chinese National Standard (CNS) A4 specification UlOx 297 mm 4 6315 1 4 9 I 2iwl doc / OiJ6 A7 V. Description of the invention (/ 7) When the disc rotates at m_, it is located on track k of the data track. When the target track is set to track kn of data track, its relative tracking number is still Is ^. If the optical head 400 can reach the g-track kn track 'before the end of the m-th rotation of the disc, that is, the optical head 400 advances to the target track along the third path 406, then when the optical head When the pulse count of the TEZC signal sequence read by the head 400 is equal to η, that is, the optical pickup head 400 reaches the target track kn track. However, when the relative rotation speed between the optical pickup 400 and the optical disc becomes larger, the optical pickup 400 will be forced to enter the area of the m + i rotation of the optical disc. If the optical read-write head 400 advances along the fourth path 408, it can be seen from the fourth path 408 that when the optical read-write head 400 enters the m + 1th area from the β-th circle area of the optical disc , It does not cross track k-1 of the data track, but advances from track k in track m to track k in track m + 1. Therefore, the relative tracking number must be corrected to n + 1 when the disc rotates at the (m + 1) th turn for reference of the TEZC signal sequence pulse count. Therefore, the following calculation rules can be summarized: (Law 1) When the optical read-write head seeks inward along the optical disc and does not reach the target track, for each increase in the number of rotations of the optical disc, the relative tracking number must be Add one track. Second, the hardware architecture and its matching firmware: Please refer to Figure 5, which shows the Seeking Servo of the optical storage device. The structure of the block is not intended. As shown in Figure 5, the optical disc 500 is driven and rotated by a spindle motor 502, and the optical read-write head 504 is used to write data to the optical disc ----------- --- I ---- Order · '-------- I (Please read the notes on the back before filling out this page) Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper is applicable to China Standard (CNS) A4 specification (21ϋ X 297 mm) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 4631 5 1 4 I 21 w I. ί-i 〇c '0 0 6 ^ * 137 5. Description of the invention (/ 1) 500 or read data from the optical disc 500. The spindle motor 502 and the optical read-write head 504 are driven by a driver (Power Driver), respectively. The signal read by the optical read-write head 504 is processed by the front-end processor (rf AMP) 506 'to obtain the cross-track error zero-crossing (TEZC) signal 5 08 using the cross-track error zero-crossing signal 508 and The feedback signal 510 ′ fed back by the spindle motor 502 and the aforementioned calculation rule can dynamically modify the relative tracking number between the data track where the optical pickup head is located and the target track during the tracking operation. Please refer to FIG. 6 ', which illustrates a block diagram of the structure of a tracking system for dynamically modifying the relative tracking number of an optical storage device according to a preferred embodiment of the present invention. The tracking system used to dynamically modify the relative tracking number of the present invention includes a down counter 602, an up counter 604, a microprocessor 600, and the like. As shown in FIG. 6, the down counter 602 is coupled to the optical read-write head (such as 504 in FIG. 5) and the microprocessor 600 to receive the static relative tracking provided by the microprocessor 600. And the Enable signal and the TEZC signal from the optical head to calculate the residual track number and output it to the microprocessor 600. The up counter 604 is respectively coupled with the spindle motor (502 in Fig. 5) and the microprocessor 600, and is used for receiving the feedback signal returned by the spindle motor to calculate the number of disc revolutions, and the counter overflow flag (Overflow Flag) is output to the microprocessor 600. The microprocessor 600 in Figure 6 and the down counter 602 and the paper size are applicable to the Chinese National Standard (CNS) A4 specifications (_210 X 297 mm) ----------- {- Packing -------- Order --------- R (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs " 46315 1 40! 2i wf Joe; 00 6 8 7 B7 V. Description of the invention (/)) The count-up counter 604 is coupled, and the count-down counter 602 and the count-up counter 604 are controlled by an actuation signal, and the count-up is set by a reset signal The counter 604 resets the pulse count of the TEZC signal to zero. The functions of the microprocessor 600 include: calculating the static relative tracking number, comparing the overflow flag of the counter output by the up counter 604 with the number of remaining tracks output by the down counter 602, determining whether the optical pickup head reaches the target track, And control the driver to move the optical pickup head to the positioning and so on. Please refer to FIG. 7, which illustrates a timing diagram of various signals during a tracking operation according to a preferred embodiment of the present invention, a tracking system for dynamically modifying the relative tracking number of an optical storage device. These include cross-track error zero-crossing (TEZC) signals, spindle motor feedback signals, counter overflow flags, reset signals, and the number of disc rotations and remaining tracks. FIG. 8 shows a method for counting and tracking the number of dynamically corrected relative tracking numbers of an optical storage device and a tracking system according to a preferred embodiment of the present invention. The cross-track signal in the figure is provided by the optical read-write head, which is received by the countdown counter. It is used to calculate the remaining number of tracks in conjunction with the static relative tracking number set by the microprocessor. Each time the spindle motor rotates once, the spindle motor feedback signal generates six square wave pulses. The up counter generates the corresponding counter overflow flag according to the feedback signal pulse received by the spindle motor. Therefore, each time the up counter receives The six feedback signal pulses generate a corresponding overflow flag. After the microprocessor receives the overflow flag output from the count-up counter, it transmits a reset signal to the count-up counter so that the feedback signal pulse count returns to zero to recalculate the number of feedback signal pulses and calculate the optical disc spinner based on it Paper size applies to China National Standard (CNS) A4 specifications (2) ϋ X 297 mm) (Please read the precautions on the back before filling this page) Loading -------- Order ----- Feng Wu Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 463151 4l) I 2t \\ t \ doc 00 () B7 Description of the invention (4) Number of revolutions. According to the obtained number of disc rotations and the remaining number of tracks, the microprocessor can dynamically modify the relative between the data track where the optical pickup head is located and the target track during the tracking operation according to the aforementioned calculation method. Tracking number. Regarding the counting method and tracking system for the dynamic correction of the relative tracking number of the present invention, please refer to FIG. 8, and cooperate with FIG. 7 and reference FIG. Step 8 0 0 'in the first set the disk rotation number K stored in the microprocessor (600 in Fig. 6) to zero (K = 0), that is, temporarily the rotation number in the microprocessor Set the value of the register to zero and reset the counter with the microprocessor (600 in Figure 6). Set the static relative tracking number N in the down counter (602 in Figure 6), and count up. The counter (604 in Figure 6) is set to zero. Next, as shown in step 802 in FIG. 8, a tracking operation is performed. Then proceed to step 804 in FIG. 8 and refer to FIG. 7 at the same time. At this time, the counting down counter obtains the cross-track signal from the optical read-write head, and cooperates with the static relative tracking number to obtain the remaining track number N. The spindle motor receives the feedback signal from its output. Each time the down-counter receives a cross-track signal, it corrects its relative tracking number and transmits the remaining number of tracks after the correction to the microprocessor. Then, as shown in step 806 in Fig. 8, the up counter determines whether to send the overflow flag according to the spindle motor feedback signal received by it. When the number of feedback signal pulses it receives from the spindle motor reaches six, it will send a counter overflow flag from the up-counter to the microprocessor. If the up counter sends the overflow flag ', then proceed to the step in Figure 8 ----------- ^. ------ order --------- line (Please read first Note on the back, please fill in this page again.) This paper size applies the Chinese National Standard (CNS) A4 specification (2〗 0 > ^ 97g) 463151 Λ7 B7 V. Description of the invention (6) 808, the microprocessor receives from the above After counting the overflow flag of the counter, set the number of rotations of the disc to increase by one according to the received overflow flag of the counter, that is, increase the number stored in the rotation register by one, and send the reset signal. The counter is counted up, and its feedback signal pulse count is reset to zero. Then, according to step 810 in FIG. 8, it is determined whether the tracking operation is outward tracking. If the up counter does not send the overflow flag, go directly to step 810 in FIG. 8 to determine whether it is tracking outward. If step 810 in FIG. 8 is judged to seek outward, then step 812 in FIG. 8 is performed, and the microprocessor determines whether the remaining number of tracks in the down counter is equal to the disc stored in the rotary register. Number of rotations. When the number of remaining tracks in the down counter is equal to the number of disc rotations stored in the rotary register, the optical head has reached the target data track, so the tracking operation is ended. If the remaining number of tracks in the down counter is not equal to the number of disc rotations stored in the rotation number register, repeat step 802 in FIG. 8 again to continue the tracking operation. If it is determined in step 810 in FIG. 8 that the external tracking is not performed, that is, the tracking operation is performed inward, then step 8 in FIG. 8 is performed. Whether the remaining number of tracks is equal to the negative number of disc rotations stored in the rotation number register. When the remaining number of tracks in the down counter is equal to the negative number of disc rotations stored in the rotation number register, the optical head has reached the target data track, so the tracking operation is ended. When the remaining number of tracks is not equal to the negative number of the number of disc rotations stored in the rotation number register, repeat step 802 in FIG. 8 again to continue the tracking operation. (Please read the notes on the back before filling in this page) Standard (CNS) A4 (210 x 297 mm) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 631 5 1
4 0 I 2 ΐ wf.doc 0()6 AT _ B7 五、發明說明（/¾) 以習知方式與本發明之動態計數方式，使用同-.個光 機換組與|uij......組伺;Μ控制參數，進fr尋軌測試之結果如 下： (1)跳軌次數比較統計：使用傳統方式執行尋軌動作 時’其所需跳軌之次數平均爲4.62次。而使用本發明之 動態修正相對尋軌數方式，其所需的跳軌次數平均則爲 3 .89 次。 (2 )使用”W inbcnch 98”測試碟片與測試程式比較統 計：使用習知方式執f-Γ ] 000次尋軌並重複1 〇次，其平均 拾取時間爲101 .2毫秒（ms)。使用本發明之動態補償方式 執行1000次尋軌並重複10次，其平均拾取時間則爲93 毫秒ε 因此使用本發明經由動態修正相對尋軌數，可使光碟 機之平均跳軌次數減少0.73次，而存取時間則平均降低 了 8.2毫秒。請參照第1表，其所列示的是習知技藝與本 發明之動態修正相對尋軌數計數方法及尋軌系統的特性比 較。其中傳統方法與本發明兩者，係使用同一個光機模組 與同·組伺服控制參數進行測試。 由上述本發明較佳實施例可知，應用本發明之動態修 正相對尋軌數計數方法及尋軌系統，當光碟機執行尋軌動 作，可以修正當光學讀取頭與光碟片均處於動態時所產生 的相對尋軌數的誤差’使光學讀取頭準確移動至正確的資 料軌以讀取資料，降低平均跳軌次數，縮短平均資料拾取 時間，提高光學儲存裝置的拾取速率’增進光學儲存裝置 本紙張尺度適用中國國家標準（CNS)A4規格（210 x 297公釐） -------111—- · I I I I I — 訂-- -----1 I ^ (請先閱讀背面之注意事項再填寫本頁> 4 6 3 15 A7 B7 五、發明說明（/0) 的存取效能。 第1表習知技藝與本發明之特|生比較 . -—" 使用傳統方 式尋軌 使用本發明 方式尋軌 改進效益 平均跳軌次數 4.62 次 3.89 次 減少0.73次 執行1000次 尋軌並重複 10次之平均 資料拾取時間 101 . 2毫秒 93毫秒 降低8.2毫 秒 - - - - -- -- ---~ --- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消费合作社印製 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何熟習此技藝者，在不脫離本發明之精神 和範圍內，當可作各種之更動與潤飾，因此本發明之保護 範圍當視後附之申請專利範圍所界定者爲準。 本紙張尺度適用中國國家標準（CNS)A4規格（2】0 * 297公釐）4 0 I 2 ΐ wf.doc 0 () 6 AT _ B7 V. Description of the invention (/ ¾) The conventional method and the dynamic counting method of the present invention use the same-. ... group control; M control parameters, the results of the tracking test are as follows: (1) Comparison statistics of the number of track jumps: When using the traditional method to perform the tracking action, the number of track jumps required is an average of 4.62 times. However, using the dynamic correction relative tracking number method of the present invention, the average number of track jumps required is 3.89 times. (2) Comparison statistics using "W inbcnch 98" test disc and test program: f-Γ [track] tracking and repeating 10 times using the conventional method, the average pickup time is 101.2 milliseconds (ms). Using the dynamic compensation method of the present invention to perform 1000 tracking and repeat 10 times, the average pickup time is 93 ms ε. Therefore, by using the present invention to dynamically modify the relative tracking number, the average number of track jumps of the optical disc drive can be reduced by 0.73 times , And the access time was reduced by an average of 8.2 milliseconds. Please refer to Table 1, which shows the comparison between the conventional technique and the dynamic correction relative tracking number counting method and the characteristics of the tracking system of the present invention. The traditional method and the present invention both use the same optical machine module and the same set of servo control parameters for testing. It can be known from the above-mentioned preferred embodiments of the present invention that by applying the dynamic correction relative tracking number counting method and tracking system of the present invention, when the optical disc drive performs a tracking operation, it can correct the situation when the optical pickup and the optical disc are both in dynamic state The resulting relative tracking number error 'makes the optical pickup head accurately move to the correct data track to read the data, reduces the average number of track jumps, shortens the average data pickup time, and increases the pickup rate of the optical storage device' improves the optical storage device This paper size is applicable to China National Standard (CNS) A4 (210 x 297 mm) ------- 111—- · IIIII — Order------ 1 I ^ (Please read the note on the back first Please fill in this page again for the items > 4 6 3 15 A7 B7 V. Access performance of the invention description (/ 0). Table 1 Comparison of the know-how and the special features of the present invention. -— " Tracking in the traditional way Use the method of the present invention to improve the efficiency of the average track jumping times 4.62 times 3.89 times reduced 0.73 times The average data pick-up time of performing 1000 tracking and repeating 10 times 101.2 ms 93 ms reduced 8.2 ms------ --- ~ --- (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in this art, Various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be defined by the scope of the attached patent application. This paper standard applies to Chinese National Standards (CNS) A4 specifications (2) 0 * 297 mm